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What color are road signs used to caution drivers?

  1. Green

  2. Orange

  3. Blue

  4. Yellow

The correct answer is: Yellow

Road signs used to caution drivers are typically yellow in color. This is because yellow is a highly visible color and stands out against most backgrounds. Green and blue are used for informational signs, while orange is commonly used for construction and work zone signs. Therefore, these options are incorrect for cautionary signs.